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(a) Voxel shapes for different writing depths and laser energies as obtained from the  direction transmission CLSM images. (b) Lateral CLSM images of three voxels with the approximate same shape at 6, 11, and depths (1st, 6th, and 13th layers, respectively). (c) Micrograph image of the written structure and (d) detail of the fcc structure from the top view ( direction).
Transmission spectrum of the 3D photonic structure along the  direction.
(a) Confocal luminescence image of a single voxel at from sample’s surface, measured along the  direction. (b) luminescence intensity profile (dotted line) and its corresponding Gaussian fit (continuous line). Also displayed is the lateral CLSM profile of the same voxel as obtained from Fig. 1(b).
(a) Luminescence spectra of ions inside and outside the 3D photonic structure. (b) Detail of the normalized 1065 nm emission peak inside and outside the 3D photonic structure.
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